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Diffstat (limited to 'include/driver/temp_sensor/thermistor.h')
| -rw-r--r-- | include/driver/temp_sensor/thermistor.h | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/include/driver/temp_sensor/thermistor.h b/include/driver/temp_sensor/thermistor.h deleted file mode 100644 index adcd5c5be4..0000000000 --- a/include/driver/temp_sensor/thermistor.h +++ /dev/null @@ -1,166 +0,0 @@ -/* Copyright 2015 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* Thermistor module for Chrome EC */ - -#ifndef __CROS_EC_TEMP_SENSOR_THERMISTOR_H -#define __CROS_EC_TEMP_SENSOR_THERMISTOR_H - -struct thermistor_data_pair { - uint8_t mv; /* Scaled voltage level at ADC (in mV) */ - uint8_t temp; /* Temperature in Celsius */ -}; - -struct thermistor_info { - uint8_t scaling_factor; /* Scaling factor for voltage in data pair. */ - uint8_t num_pairs; /* Number of data pairs. */ - - /* - * Values between given data pairs will be calculated as points on - * a line. Pairs can be derived using the Steinhart-Hart equation. - * - * Guidelines for data sets: - * - Must contain at least two pairs. - * - First and last pairs are the max and min. - * - Pairs must be sorted in descending order. - * - 5 pairs should provide reasonable accuracy in most cases. Use - * points where the slope changes significantly or to recalibrate - * the algorithm if needed. - */ - const struct thermistor_data_pair *data; -}; - -/** - * Calculate temperature using linear interpolation of data points. - * - * Given a set of datapoints, the algorithm will calculate the "step" in - * between each one in order to interpolate missing entries. - * - * @param mv Value read from ADC (in millivolts). - * @param info Reference data set and info. - * - * @return temperature in C - */ -int thermistor_linear_interpolate(uint16_t mv, - const struct thermistor_info *info); - -#ifdef CONFIG_THERMISTOR_NCP15WB -/** - * ncp15wb temperature conversion routine. - * - * @param adc 10bit raw data on adc. - * - * @return temperature in C. - */ -int ncp15wb_calculate_temp(uint16_t adc); -#endif /* CONFIG_THERMISTOR_NCP15WB */ - -#ifdef CONFIG_STEINHART_HART_3V3_13K7_47K_4050B -/** - * Reads the specified ADC channel and uses a lookup table and interpolation to - * return a temperature in degrees K. - * - * The lookup table is based off of a resistor divider circuit on 3.3V with a - * 13.7K resistor in series with a thermistor with nominal value of 47K (at 25C) - * and a B (25/100) value of 4050. - * - * @param idx_adc The idx value from the temp_sensor_t struct, which is - * the ADC channel to read and convert to degrees K - * @param temp_ptr Destination for temperature (in degrees K) - * - * @return EC_SUCCESS, or non-zero if error. - */ -int get_temp_3v3_13k7_47k_4050b(int idx_adc, int *temp_ptr); -#endif - -#ifdef CONFIG_STEINHART_HART_3V3_51K1_47K_4050B -/** - * Reads the specified ADC channel and uses a lookup table and interpolation to - * return a temperature in degrees K. - * - * The lookup table is based off of a resistor divider circuit on 3.3V with a - * 51.1K resistor in series with a thermistor with nominal value of 47K (at 25C) - * and a B (25/100) value of 4050. - * - * @param idx_adc The idx value from the temp_sensor_t struct, which is - * the ADC channel to read and convert to degrees K - * @param temp_ptr Destination for temperature (in degrees K) - * - * @return EC_SUCCESS, or non-zero if error. - */ -int get_temp_3v3_51k1_47k_4050b(int idx_adc, int *temp_ptr); -#endif - -#ifdef CONFIG_STEINHART_HART_6V0_51K1_47K_4050B -/** - * Reads the specified ADC channel and uses a lookup table and interpolation to - * return a temperature in degrees K. - * - * The lookup table is based off of a resistor divider circuit on 6.0V with a - * 51.1K resistor in series with a thermistor with nominal value of 47K (at 25C) - * and a B (25/100) value of 4050. - * - * @param idx_adc The idx value from the temp_sensor_t struct, which is - * the ADC channel to read and convert to degrees K - * @param temp_ptr Destination for temperature (in degrees K) - * - * @return EC_SUCCESS, or non-zero if error. - */ -int get_temp_6v0_51k1_47k_4050b(int idx_adc, int *temp_ptr); -#endif - -#ifdef CONFIG_STEINHART_HART_3V0_22K6_47K_4050B -/** - * Reads the specified ADC channel and uses a lookup table and interpolation to - * return a temperature in degrees K. - * - * The lookup table is based off of a resistor divider circuit on 3V with a - * 22.6K resistor in series with a thermistor with nominal value of 47K (at 25C) - * and a B (25/100) value of 4050. - * - * @param idx_adc The idx value from the temp_sensor_t struct, which is - * the ADC channel to read and convert to degrees K - * @param temp_ptr Destination for temperature (in degrees K) - * - * @return EC_SUCCESS, or non-zero if error. - */ -int get_temp_3v0_22k6_47k_4050b(int idx_adc, int *temp_ptr); -#endif - -#ifdef CONFIG_STEINHART_HART_3V3_30K9_47K_4050B -/** - * Reads the specified ADC channel and uses a lookup table and interpolation to - * return a temperature in degrees K. - * - * The lookup table is based off of a resistor divider circuit on 3.3V with a - * 30.9K resistor in series with a thermistor with nominal value of 47K (at 25C) - * and a B (25/100) value of 4050. - * - * @param idx_adc The idx value from the temp_sensor_t struct, which is - * the ADC channel to read and convert to degrees K - * @param temp_ptr Destination for temperature (in degrees K) - * - * @return EC_SUCCESS, or non-zero if error. - */ -int get_temp_3v3_30k9_47k_4050b(int idx_adc, int *temp_ptr); -#endif - -/** - * Reads the sensor's ADC channel and uses a lookup table and interpolation to - * argument thermistor_info for interpolation to return a temperature in degrees - * K. - * - * @param idx_adc The idx value from the temp_sensor_t struct, which is - * the ADC channel to read and convert to degrees K - * @param temp_ptr Destination for temperature (in degrees K) - * @param info Structure containing information about the underlying thermistor - * that is necessary to interpolate temperature - * - * @return EC_SUCCESS, or non-zero if error. - */ -int thermistor_get_temperature(int idx_adc, int *temp_ptr, - const struct thermistor_info *info); - -#endif /* __CROS_EC_TEMP_SENSOR_THERMISTOR_NCP15WB_H */ |